fan impeller for transformers
Fan Impeller For Transformer
The existing fan for transformer mainly includes an impeller, a motor and a bracket, a wind guide cylinder and a mesh cover. The impeller is composed of a blade and a hub. The impeller is assembled as a rotary component on the shaft end of the motor, and is a key component for generating a wind beam. The conventional impeller hubs are mostly cylindrical structures, and the blades are mounted on the cylindrical surface of the hub by screws through connecting rods. The impeller assembled by the cylindrical structure hub has a certain distance between the root of the blade and the cylindrical surface, so the diameter ratio of the hub to the impeller is small, the loss is large, the efficiency is low, and the total pressure is small; since the end surface of the cylindrical structure has a wind obstruction Therefore, the noise of the fan is high, and the aerodynamic parameters of the cross section of the wind beam are not uniform (the center is weak, the periphery is strong), which affects the effect of dissipating heat.
The fan impeller for transformers is used for large and medium-sized transformers, rectifier transformers, reactors, and power transformer oil circulation cooling systems. The impeller includes a blade and a hub, the circumferential direction of the hub is designed as a spherical surface, and the root of the blade is also processed into a matching spherical surface. The root of the blade is fastened to the spherical surface of the hub by three connecting screws, and the blades of three to seven pieces are evenly distributed. Distributed on the spherical surface of the hub. Since there is no gap between the blade and the spherical hub, the diameter ratio of the hub to the impeller can be maximized, and the aerodynamic parameters are lossless, so that the total pressure is maximized. The end effect of the spherical structure of the hub is greatly reduced, so that the loss of the aerodynamic parameters is small, the noise of the fan is greatly reduced, the aerodynamic parameters of the cross section of the wind beam are also uniform, and the effect of dissipating heat is good.
Figure 1 Figure 2
Figure 1 is a schematic view of the structure of the impeller;
Figure 2 is a cross-sectional view taken along line A-A of Figure 1.
In the figure, 1 is the air guiding cylinder, 2 is the blade, 3 is the hub, 4 is the mesh cover, 5 is the motor, 6 is the motor bracket, and 7 is the connecting screw mounting hole.